Aluminum capacitors have relatively high equivalent series resistance (ESR), which means that they generate high heat for a given current level. Aluminum capacitors are low cost, have a high capacitance value and high energy density value. Energy density determines the amount of energy that may be stored in a given volume. aluminum capacitors are a subgroup of the electrolytic capacitors. They are polarized so they must be connected to positive voltage only. According to the type of electrolyte used, aluminum capacitors are further subdivided into two groups: non-solid aluminum capacitors and solid aluminum capacitors.















